Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL KLj
STEP
INSPECTION ACTION
6 CHECK IAC VALVE SIGNAL CIRCUIT
CONTINUITY
• Key off.
• IAC valve disconnected.
• Disconnect PCM. Inspect for damaged or
pushed out pins, corrosion, loose wires,
etc. Service as necessary.
• Install breakout box. Leave PCM
disconnected.
• Measure resistance between appropriate
Test Pin at breakout box and IAC valve
circuit at IAC valve connector.
• IAC valve terminal A and Test Pin 20
• IAC valve terminal B and Test Pin 83
• Is resistance less than 5.0 ohms?
Yes Go to next step.
No SERVICE open circuit.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
7 CHECK IAC VALVE CIRCUIT FOR SHORT
TO POWER CIRCUIT
• Key off.
• Breakout box installed. PCM disconnected.
• IAC valve disconnected.
• Key on, engine off.
• Measure voltage between appropriate Test
Pin at breakout box and chassis ground.
• IAC valve=Test Pin 20
• IAC valve=Test Pin 83
• Is voltage less than 1.0 volt?
Yes Go to next step.
No SERVICE short circuit.
REMOVE breakout box.
RECONNECT all components.
RERUN OBD Test.
8 CHECK IAC VALVE SIGNAL CIRCUIT FOR
SHORT TO GROUND
• Key off.
• Breakout box installed. PCM disconnected.
• IAC valve disconnected.
• Measure resistance between appropriate
Test Pin at breakout box and Test Pins 51
and 103 at breakout box.
• IAC valve=Test Pin 20
• IAC valve=Test Pin 83
• Is each resistance greater than 10,000
ohms?
Yes
Go to next step.
No
SERVICE short circuit.
RECONNECT all components.
RERUN OBD Test.
9
CHECK IAC VALVE SIGNAL FROM PCM
• Key off.
• Breakout box installed.
• Reconnect PCM to breakout box.
• Reconnect IAC valve.
• Connect DVOM between Test Pin 83 and
Test Pin 51 at breakout box.
• Start engine.
• Slowly increase to 3,000 rpm.
•
Is voltage between 3.0 and 11.5 volts?
Yes For Continuous Memory DTCs P1504 and P1507.
Go to next step.
INSPECT throttle body for damage, SERVICE as
necessary.
If okay, REPLACE IAC valve component.
RESET PCM to completely clear DTCs.
irr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No REPLACE PCM.
REMOVE breakout box.
RECONNECT
all com ponents.
RERUN OBD Test.
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